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ComparisonChain (Guava: Google Core Libraries for Java - r09)
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com.google.common.collect</FONT>
<BR>
Class ComparisonChain</H2>
<PRE>
<A HREF="http://download.oracle.com/javase/6/docs/api/java/lang/Object.html?is-external=true" title="class or interface in java.lang">java.lang.Object</A>
  <IMG SRC="../../../../resources/inherit.gif" ALT="extended by "><B>com.google.common.collect.ComparisonChain</B>
</PRE>
<HR>
<DL>
<DT><PRE><FONT SIZE="-1"><A HREF="../../../../com/google/common/annotations/GwtCompatible.html" title="annotation in com.google.common.annotations">@GwtCompatible</A>
</FONT>public abstract class <B>ComparisonChain</B><DT>extends <A HREF="http://download.oracle.com/javase/6/docs/api/java/lang/Object.html?is-external=true" title="class or interface in java.lang">Object</A></DL>
</PRE>

<P>
A utility for performing a "lazy" chained comparison statement, which 
 performs comparisons only until it finds a nonzero result. For example:
 <pre>   <code>public int compareTo(Foo that) {
     return ComparisonChain.start()
         .compare(this.aString, that.aString)
         .compare(this.anInt, that.anInt)
         .compare(this.anEnum, that.anEnum, Ordering.natural().nullsLast())
         .result();
   }</code></pre>

 The value of this expression will have the same sign as the <i>first
 nonzero</i> comparison result in the chain, or will be zero if every
 comparison result was zero.

 <p>Once any comparison returns a nonzero value, remaining comparisons are
 "short-circuited".
<P>

<P>
<DL>
<DT><B>Since:</B></DT>
  <DD>2</DD>
<DT><B>Author:</B></DT>
  <DD>Mark Davis, Kevin Bourrillion</DD>
</DL>
<HR>

<P>

<!-- ========== METHOD SUMMARY =========== -->

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<TD ALIGN="right" VALIGN="top" WIDTH="1%"><FONT SIZE="-1">
<CODE>abstract &nbsp;<A HREF="../../../../com/google/common/collect/ComparisonChain.html" title="class in com.google.common.collect">ComparisonChain</A></CODE></FONT></TD>
<TD><CODE><B><A HREF="../../../../com/google/common/collect/ComparisonChain.html#compare(boolean, boolean)">compare</A></B>(boolean&nbsp;left,
        boolean&nbsp;right)</CODE>

<BR>
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;Compares two <code>boolean</code> values as specified by <A HREF="../../../../com/google/common/primitives/Booleans.html#compare(boolean, boolean)"><CODE>Booleans.compare(boolean, boolean)</CODE></A>, <i>if</i> the result of this comparison chain has not
 already been determined.</TD>
</TR>
<TR BGCOLOR="white" CLASS="TableRowColor">
<TD ALIGN="right" VALIGN="top" WIDTH="1%"><FONT SIZE="-1">
<CODE>abstract &nbsp;<A HREF="../../../../com/google/common/collect/ComparisonChain.html" title="class in com.google.common.collect">ComparisonChain</A></CODE></FONT></TD>
<TD><CODE><B><A HREF="../../../../com/google/common/collect/ComparisonChain.html#compare(java.lang.Comparable, java.lang.Comparable)">compare</A></B>(<A HREF="http://download.oracle.com/javase/6/docs/api/java/lang/Comparable.html?is-external=true" title="class or interface in java.lang">Comparable</A>&lt;?&gt;&nbsp;left,
        <A HREF="http://download.oracle.com/javase/6/docs/api/java/lang/Comparable.html?is-external=true" title="class or interface in java.lang">Comparable</A>&lt;?&gt;&nbsp;right)</CODE>

<BR>
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;Compares two comparable objects as specified by <A HREF="http://download.oracle.com/javase/6/docs/api/java/lang/Comparable.html?is-external=true#compareTo(T)" title="class or interface in java.lang"><CODE>Comparable.compareTo(T)</CODE></A>, <i>if</i> the result of this comparison chain
 has not already been determined.</TD>
</TR>
<TR BGCOLOR="white" CLASS="TableRowColor">
<TD ALIGN="right" VALIGN="top" WIDTH="1%"><FONT SIZE="-1">
<CODE>abstract &nbsp;<A HREF="../../../../com/google/common/collect/ComparisonChain.html" title="class in com.google.common.collect">ComparisonChain</A></CODE></FONT></TD>
<TD><CODE><B><A HREF="../../../../com/google/common/collect/ComparisonChain.html#compare(double, double)">compare</A></B>(double&nbsp;left,
        double&nbsp;right)</CODE>

<BR>
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;Compares two <code>double</code> values as specified by <A HREF="http://download.oracle.com/javase/6/docs/api/java/lang/Double.html?is-external=true#compare(double, double)" title="class or interface in java.lang"><CODE>Double.compare(double, double)</CODE></A>, <i>if</i> the result of this comparison chain has not
 already been determined.</TD>
</TR>
<TR BGCOLOR="white" CLASS="TableRowColor">
<TD ALIGN="right" VALIGN="top" WIDTH="1%"><FONT SIZE="-1">
<CODE>abstract &nbsp;<A HREF="../../../../com/google/common/collect/ComparisonChain.html" title="class in com.google.common.collect">ComparisonChain</A></CODE></FONT></TD>
<TD><CODE><B><A HREF="../../../../com/google/common/collect/ComparisonChain.html#compare(float, float)">compare</A></B>(float&nbsp;left,
        float&nbsp;right)</CODE>

<BR>
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;Compares two <code>float</code> values as specified by <A HREF="http://download.oracle.com/javase/6/docs/api/java/lang/Float.html?is-external=true#compare(float, float)" title="class or interface in java.lang"><CODE>Float.compare(float, float)</CODE></A>, <i>if</i> the result of this comparison chain has not
 already been determined.</TD>
</TR>
<TR BGCOLOR="white" CLASS="TableRowColor">
<TD ALIGN="right" VALIGN="top" WIDTH="1%"><FONT SIZE="-1">
<CODE>abstract &nbsp;<A HREF="../../../../com/google/common/collect/ComparisonChain.html" title="class in com.google.common.collect">ComparisonChain</A></CODE></FONT></TD>
<TD><CODE><B><A HREF="../../../../com/google/common/collect/ComparisonChain.html#compare(int, int)">compare</A></B>(int&nbsp;left,
        int&nbsp;right)</CODE>

<BR>
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;Compares two <code>int</code> values as specified by <A HREF="../../../../com/google/common/primitives/Ints.html#compare(int, int)"><CODE>Ints.compare(int, int)</CODE></A>,
 <i>if</i> the result of this comparison chain has not already been
 determined.</TD>
</TR>
<TR BGCOLOR="white" CLASS="TableRowColor">
<TD ALIGN="right" VALIGN="top" WIDTH="1%"><FONT SIZE="-1">
<CODE>abstract &nbsp;<A HREF="../../../../com/google/common/collect/ComparisonChain.html" title="class in com.google.common.collect">ComparisonChain</A></CODE></FONT></TD>
<TD><CODE><B><A HREF="../../../../com/google/common/collect/ComparisonChain.html#compare(long, long)">compare</A></B>(long&nbsp;left,
        long&nbsp;right)</CODE>

<BR>
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;Compares two <code>long</code> values as specified by <A HREF="../../../../com/google/common/primitives/Longs.html#compare(long, long)"><CODE>Longs.compare(long, long)</CODE></A>,
 <i>if</i> the result of this comparison chain has not already been
 determined.</TD>
</TR>
<TR BGCOLOR="white" CLASS="TableRowColor">
<TD ALIGN="right" VALIGN="top" WIDTH="1%"><FONT SIZE="-1">
<CODE>abstract 
<TABLE BORDER="0" CELLPADDING="0" CELLSPACING="0" SUMMARY="">
<TR ALIGN="right" VALIGN="">
<TD NOWRAP><FONT SIZE="-1">
<CODE>&lt;T&gt; <A HREF="../../../../com/google/common/collect/ComparisonChain.html" title="class in com.google.common.collect">ComparisonChain</A></CODE></FONT></TD>
</TR>
</TABLE>
</CODE></FONT></TD>
<TD><CODE><B><A HREF="../../../../com/google/common/collect/ComparisonChain.html#compare(T, T, java.util.Comparator)">compare</A></B>(T&nbsp;left,
        T&nbsp;right,
        <A HREF="http://download.oracle.com/javase/6/docs/api/java/util/Comparator.html?is-external=true" title="class or interface in java.util">Comparator</A>&lt;T&gt;&nbsp;comparator)</CODE>

<BR>
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;Compares two objects using a comparator, <i>if</i> the result of this
 comparison chain has not already been determined.</TD>
</TR>
<TR BGCOLOR="white" CLASS="TableRowColor">
<TD ALIGN="right" VALIGN="top" WIDTH="1%"><FONT SIZE="-1">
<CODE>abstract &nbsp;int</CODE></FONT></TD>
<TD><CODE><B><A HREF="../../../../com/google/common/collect/ComparisonChain.html#result()">result</A></B>()</CODE>

<BR>
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;Ends this comparison chain and returns its result: a value having the
 same sign as the first nonzero comparison result in the chain, or zero if
 every result was zero.</TD>
</TR>
<TR BGCOLOR="white" CLASS="TableRowColor">
<TD ALIGN="right" VALIGN="top" WIDTH="1%"><FONT SIZE="-1">
<CODE>static&nbsp;<A HREF="../../../../com/google/common/collect/ComparisonChain.html" title="class in com.google.common.collect">ComparisonChain</A></CODE></FONT></TD>
<TD><CODE><B><A HREF="../../../../com/google/common/collect/ComparisonChain.html#start()">start</A></B>()</CODE>

<BR>
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;Begins a new chained comparison statement.</TD>
</TR>
</TABLE>
&nbsp;<A NAME="methods_inherited_from_class_java.lang.Object"><!-- --></A>
<TABLE BORDER="1" WIDTH="100%" CELLPADDING="3" CELLSPACING="0" SUMMARY="">
<TR BGCOLOR="#EEEEFF" CLASS="TableSubHeadingColor">
<TH ALIGN="left"><B>Methods inherited from class java.lang.<A HREF="http://download.oracle.com/javase/6/docs/api/java/lang/Object.html?is-external=true" title="class or interface in java.lang">Object</A></B></TH>
</TR>
<TR BGCOLOR="white" CLASS="TableRowColor">
<TD><CODE><A HREF="http://download.oracle.com/javase/6/docs/api/java/lang/Object.html?is-external=true#clone()" title="class or interface in java.lang">clone</A>, <A HREF="http://download.oracle.com/javase/6/docs/api/java/lang/Object.html?is-external=true#equals(java.lang.Object)" title="class or interface in java.lang">equals</A>, <A HREF="http://download.oracle.com/javase/6/docs/api/java/lang/Object.html?is-external=true#finalize()" title="class or interface in java.lang">finalize</A>, <A HREF="http://download.oracle.com/javase/6/docs/api/java/lang/Object.html?is-external=true#getClass()" title="class or interface in java.lang">getClass</A>, <A HREF="http://download.oracle.com/javase/6/docs/api/java/lang/Object.html?is-external=true#hashCode()" title="class or interface in java.lang">hashCode</A>, <A HREF="http://download.oracle.com/javase/6/docs/api/java/lang/Object.html?is-external=true#notify()" title="class or interface in java.lang">notify</A>, <A HREF="http://download.oracle.com/javase/6/docs/api/java/lang/Object.html?is-external=true#notifyAll()" title="class or interface in java.lang">notifyAll</A>, <A HREF="http://download.oracle.com/javase/6/docs/api/java/lang/Object.html?is-external=true#toString()" title="class or interface in java.lang">toString</A>, <A HREF="http://download.oracle.com/javase/6/docs/api/java/lang/Object.html?is-external=true#wait()" title="class or interface in java.lang">wait</A>, <A HREF="http://download.oracle.com/javase/6/docs/api/java/lang/Object.html?is-external=true#wait(long)" title="class or interface in java.lang">wait</A>, <A HREF="http://download.oracle.com/javase/6/docs/api/java/lang/Object.html?is-external=true#wait(long, int)" title="class or interface in java.lang">wait</A></CODE></TD>
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<A NAME="start()"><!-- --></A><H3>
start</H3>
<PRE>
public static <A HREF="../../../../com/google/common/collect/ComparisonChain.html" title="class in com.google.common.collect">ComparisonChain</A> <B>start</B>()</PRE>
<DL>
<DD>Begins a new chained comparison statement. See example in the class
 documentation.
<P>
<DD><DL>
</DL>
</DD>
</DL>
<HR>

<A NAME="compare(java.lang.Comparable, java.lang.Comparable)"><!-- --></A><H3>
compare</H3>
<PRE>
public abstract <A HREF="../../../../com/google/common/collect/ComparisonChain.html" title="class in com.google.common.collect">ComparisonChain</A> <B>compare</B>(<A HREF="http://download.oracle.com/javase/6/docs/api/java/lang/Comparable.html?is-external=true" title="class or interface in java.lang">Comparable</A>&lt;?&gt;&nbsp;left,
                                        <A HREF="http://download.oracle.com/javase/6/docs/api/java/lang/Comparable.html?is-external=true" title="class or interface in java.lang">Comparable</A>&lt;?&gt;&nbsp;right)</PRE>
<DL>
<DD>Compares two comparable objects as specified by <A HREF="http://download.oracle.com/javase/6/docs/api/java/lang/Comparable.html?is-external=true#compareTo(T)" title="class or interface in java.lang"><CODE>Comparable.compareTo(T)</CODE></A>, <i>if</i> the result of this comparison chain
 has not already been determined.
<P>
<DD><DL>
</DL>
</DD>
</DL>
<HR>

<A NAME="compare(java.lang.Object,java.lang.Object,java.util.Comparator)"><!-- --></A><A NAME="compare(T, T, java.util.Comparator)"><!-- --></A><H3>
compare</H3>
<PRE>
public abstract &lt;T&gt; <A HREF="../../../../com/google/common/collect/ComparisonChain.html" title="class in com.google.common.collect">ComparisonChain</A> <B>compare</B>(<FONT SIZE="-1"><A HREF="http://jsr-305.googlecode.com/svn/trunk/javadoc/javax/annotation/Nullable.html?is-external=true" title="class or interface in javax.annotation">@Nullable</A></FONT>
                                            T&nbsp;left,
                                            <FONT SIZE="-1"><A HREF="http://jsr-305.googlecode.com/svn/trunk/javadoc/javax/annotation/Nullable.html?is-external=true" title="class or interface in javax.annotation">@Nullable</A></FONT>
                                            T&nbsp;right,
                                            <A HREF="http://download.oracle.com/javase/6/docs/api/java/util/Comparator.html?is-external=true" title="class or interface in java.util">Comparator</A>&lt;T&gt;&nbsp;comparator)</PRE>
<DL>
<DD>Compares two objects using a comparator, <i>if</i> the result of this
 comparison chain has not already been determined.
<P>
<DD><DL>
</DL>
</DD>
</DL>
<HR>

<A NAME="compare(int, int)"><!-- --></A><H3>
compare</H3>
<PRE>
public abstract <A HREF="../../../../com/google/common/collect/ComparisonChain.html" title="class in com.google.common.collect">ComparisonChain</A> <B>compare</B>(int&nbsp;left,
                                        int&nbsp;right)</PRE>
<DL>
<DD>Compares two <code>int</code> values as specified by <A HREF="../../../../com/google/common/primitives/Ints.html#compare(int, int)"><CODE>Ints.compare(int, int)</CODE></A>,
 <i>if</i> the result of this comparison chain has not already been
 determined.
<P>
<DD><DL>
</DL>
</DD>
</DL>
<HR>

<A NAME="compare(long, long)"><!-- --></A><H3>
compare</H3>
<PRE>
public abstract <A HREF="../../../../com/google/common/collect/ComparisonChain.html" title="class in com.google.common.collect">ComparisonChain</A> <B>compare</B>(long&nbsp;left,
                                        long&nbsp;right)</PRE>
<DL>
<DD>Compares two <code>long</code> values as specified by <A HREF="../../../../com/google/common/primitives/Longs.html#compare(long, long)"><CODE>Longs.compare(long, long)</CODE></A>,
 <i>if</i> the result of this comparison chain has not already been
 determined.
<P>
<DD><DL>
</DL>
</DD>
</DL>
<HR>

<A NAME="compare(float, float)"><!-- --></A><H3>
compare</H3>
<PRE>
public abstract <A HREF="../../../../com/google/common/collect/ComparisonChain.html" title="class in com.google.common.collect">ComparisonChain</A> <B>compare</B>(float&nbsp;left,
                                        float&nbsp;right)</PRE>
<DL>
<DD>Compares two <code>float</code> values as specified by <A HREF="http://download.oracle.com/javase/6/docs/api/java/lang/Float.html?is-external=true#compare(float, float)" title="class or interface in java.lang"><CODE>Float.compare(float, float)</CODE></A>, <i>if</i> the result of this comparison chain has not
 already been determined.
<P>
<DD><DL>
</DL>
</DD>
</DL>
<HR>

<A NAME="compare(double, double)"><!-- --></A><H3>
compare</H3>
<PRE>
public abstract <A HREF="../../../../com/google/common/collect/ComparisonChain.html" title="class in com.google.common.collect">ComparisonChain</A> <B>compare</B>(double&nbsp;left,
                                        double&nbsp;right)</PRE>
<DL>
<DD>Compares two <code>double</code> values as specified by <A HREF="http://download.oracle.com/javase/6/docs/api/java/lang/Double.html?is-external=true#compare(double, double)" title="class or interface in java.lang"><CODE>Double.compare(double, double)</CODE></A>, <i>if</i> the result of this comparison chain has not
 already been determined.
<P>
<DD><DL>
</DL>
</DD>
</DL>
<HR>

<A NAME="compare(boolean, boolean)"><!-- --></A><H3>
compare</H3>
<PRE>
public abstract <A HREF="../../../../com/google/common/collect/ComparisonChain.html" title="class in com.google.common.collect">ComparisonChain</A> <B>compare</B>(boolean&nbsp;left,
                                        boolean&nbsp;right)</PRE>
<DL>
<DD>Compares two <code>boolean</code> values as specified by <A HREF="../../../../com/google/common/primitives/Booleans.html#compare(boolean, boolean)"><CODE>Booleans.compare(boolean, boolean)</CODE></A>, <i>if</i> the result of this comparison chain has not
 already been determined.
<P>
<DD><DL>
</DL>
</DD>
</DL>
<HR>

<A NAME="result()"><!-- --></A><H3>
result</H3>
<PRE>
public abstract int <B>result</B>()</PRE>
<DL>
<DD>Ends this comparison chain and returns its result: a value having the
 same sign as the first nonzero comparison result in the chain, or zero if
 every result was zero.
<P>
<DD><DL>
</DL>
</DD>
</DL>
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